UMP45

In multiplayer, the UMP .45 is unlocked by default. It is considered to be one of the better submachine guns. Compared to other SMGs, the UMP has moderate recoil, a low rate of fire, and kills in a maximum of 3 shots regardless of perks or attachments. The UMP only benefits from Stopping Power at close range, where the perk reduces shots required to 2, long range shots will deal 49 damage each, thus still requiring 3 shots for a kill. Also of note is that of all the automatic weapons in the game, no other SMG's, no assault rifles, and only some Light-Machine Guns share the UMP's ability to 3-shot kill without a perk, and of those weapons, the UMP is the only one capable of killing in 3 shots while silenced.